Many Mac users may like to adjust the font size of file names, folders, and other text found in the Finder of OS X.
For reference, the default text size for Finder items is size 12, and user options to change Finder text size range from size 10, 11, 12, 13, 14, 15, or font size 16 as the largest.
In the example shown here we are changing the font size of Finder items shown in List view, but it works the same in Icon view, List view, Column view, and Cover Flow. Going further, you can also increase the size of Mac icons on the desktop and in Finder windows, as well as change the Finder sidebar text size in Mac OS X to better suit your preferences as well. If you don’t see the option, you either have it off screen from a small resolution, the window is off screen,, or you are not following the instructions that are articulated in the tutorial above.
Yes I use size 14 on MacBook Pro retina I had to after Yosemite and El Capitan came out with the new hard to read fonts. All that you have previously changed will not be changed with the directions above (I think, but I am not sure because I did not try). It says pretty clearly that it works in List View, Icon View, and I just tried it in Column view and it works fine to increase the finder text size of all items in Column View too. The default text size used by Terminal app in OS X can be quite small if you’re using a large resolution display. The simplest and quickest way to increase (or decrease) the text size shown for Terminal app is using keystrokes with the Command and Plus or Minus keys.

If these command keyboard shortcuts sound familiar to you, it’s likely because you may have used them before for the same font size changes in browsers like Safari, Chrome, TextEdit, and many other apps. As we mentioned, this is a session based approach to adjusting terminal text size, which can make viewing command line details significantly easier to read. If you’re doing this to make the command line look a bit more attractive, keep in mind there are plenty of other ways to improve the appearance of Terminal app and make it more readable too. This is particularly helpful if you find the default text size of Finder fonts to be small and challenging to read when navigating in the Mac file system, where increasing the font size makes a notable difference in legibility, but it can also be used the other direction to decrease the text size of Finder items as well, thereby fitting more items on screen in list view. Changing the text size alone will have no impact on icon size, which can be changed separately. Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! While you can change the font to be better suit your preferences, and increasing the line spacing helps reading too, another simple solution to boost readability is to simply increase the text size shown on screen while visiting the command line. This will adjust the size of the display font for the currently active terminal session, but it does not change the default font size for new terminal windows or sessions, making this more of a quick solution for when you need to increase readability.
Thus, if you want to go smaller for whatever reason, or you made the text size too big with the prior keystroke, hit Command+Minus (-) key to reduce it. You can instantly return to the active Terminal profiles default text size by hitting Command+Zero.

Much like the instant Preferences shortcut, this is not quite universal, but so many apps use the Command+ and Command- trick to adjust the visible fonts that it’s nearly universal for performing that function.
If you want to change the displayed text size permanently, you’d need to adjust the Font itself, which also offers precise controls for font size, font family, and font weight. You are an expert and a scholar at leaving irrelevant and useless comments, surely you have this level of commitment to the command line. You can change, e.g Basic Terminal fonts size from 14 to 18, but after you restart Terminal app, the setting with return to 14.
Head into the Finder, and then hit Command-Shift-G, or select Go To Folder… from the Go menu.
Double click this file to open it in a text editor, and find the section, repeated for each font enabled in Notes, that says 14. The file on my Mac has a section for Noteworthy, MarkerFelt, and Helvetica fonts, each with its own number there between the integer tags.